ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 56, (1) 20 - 24 (2012)


FABRICATION OF POROUS Al2O3-BASED CERAMICS USING COMBUSTION SYNTHESIZED POWDERS
 
Bai Jiahai, Du Qingyang, Li Guochang, Li Chengfeng, Zhao Yunxia, Liu Juncheng
 
School of Materials Science and Engineering, Shandong University of Technology, ZiBo, 255049,P. R. China

Keywords: Combustion synthesis, Porous ceramics, Al2O3
 

Porous Al2O3-based ceramics were fabricated from powders synthesized via a solution combustion process using starch and urea as fuels. Effects of the relative fuel-to-oxidant ratio (ϕe = 1.4, 1.6, 1.8 and 2.0, respectively) on open porosity, pore size distribution and flexural strength of the as-prepared porous Al2O3-based ceramics were investigated. Experimental results revealed that the densification ability of the as-synthesized powders increased significantly as ϕe increased, and open porosity, pore size distribution and flexural strength of the porous ceramics exhibited remarkable dependence on the densification ability of the powders instead of the weight fraction of the charred organic residuals in the powders. SEM micrographs disclosed that the porous ceramics from the precursors with ϕe = 1.8 or 2.0 exhibited significantly homogenous microstructures including pore size and pore distribution.


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